| /* |
| * Copyright (c) 2012 - 2019, Nordic Semiconductor ASA |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright notice, this |
| * list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * 3. Neither the name of the copyright holder nor the names of its |
| * contributors may be used to endorse or promote products derived from this |
| * software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| //lint -e438 |
| |
| #include <nrfx.h> |
| #include "nrf_ecb.h" |
| #include <string.h> |
| |
| static uint8_t ecb_data[48]; ///< ECB data structure for RNG peripheral to access. |
| static uint8_t* ecb_key; ///< Key: Starts at ecb_data |
| static uint8_t* ecb_cleartext; ///< Cleartext: Starts at ecb_data + 16 bytes. |
| static uint8_t* ecb_ciphertext; ///< Ciphertext: Starts at ecb_data + 32 bytes. |
| |
| bool nrf_ecb_init(void) |
| { |
| ecb_key = ecb_data; |
| ecb_cleartext = ecb_data + 16; |
| ecb_ciphertext = ecb_data + 32; |
| |
| NRF_ECB->ECBDATAPTR = (uint32_t)ecb_data; |
| return true; |
| } |
| |
| |
| bool nrf_ecb_crypt(uint8_t * dest_buf, const uint8_t * src_buf) |
| { |
| uint32_t counter = 0x1000000; |
| if (src_buf != ecb_cleartext) |
| { |
| memcpy(ecb_cleartext,src_buf,16); |
| } |
| NRF_ECB->EVENTS_ENDECB = 0; |
| NRF_ECB->TASKS_STARTECB = 1; |
| while (NRF_ECB->EVENTS_ENDECB == 0) |
| { |
| counter--; |
| if (counter == 0) |
| { |
| return false; |
| } |
| } |
| NRF_ECB->EVENTS_ENDECB = 0; |
| if (dest_buf != ecb_ciphertext) |
| { |
| memcpy(dest_buf,ecb_ciphertext,16); |
| } |
| return true; |
| } |
| |
| void nrf_ecb_set_key(const uint8_t * key) |
| { |
| memcpy(ecb_key,key,16); |
| } |
| |
| |